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If you haven’t yet seen Justin Timberlake’s “A History of Rap” medley with Jimmy Fallon, by all means stop reading and skip to the video embed below.

Chances are you have seen the pair’s three-minute performance covering three decades of rap hits. The clip from Wednesday’s “Late Night with Jimmy Fallon” bit has gone viral.

"We never know what's going to viral or get picked up, and this one's beyond what we thought it would do," the NBC late-night host told The Associated Press on Thursday.

Aided by Fallon’s house band, the Grammy-winning hip-hop group The Roots, Wednesday’s jam kicked off by referencing Sugarhill Gang’s 1979 hit “Rapper’s Delight.”

MCs Fallon and Timberlake then segued into songs by the Beastie Boys, the late Notorious B.I.G., Jay-Z, Eminem, Kanye West and Snoop Dogg, among others. (The Wall Street Journal’s Speakeasy blog breaks down the full set list).

"I was in my apartment till 2 in the morning the night before doing Soulja Boy and my wife was like, 'You're crazy,'" Fallon told the AP, adding that Timberlake’s rhythm was “so much better than mine.”

Timberlake, who shot to fame as a member of *NSYNC, had been on “Fallon” to promote his star turn in “The Social Network.”

Before “A History of Rap,” Timberlake last scored viral bragging rights for his hand in the faux music videos “D**k in a Box” and “Mother Lover” for “SNL.”